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Subject[PATCH 7/7] [RFC] APM emulation driver for class batteries
It finds battery with "main_battery" flag set (or with max_capacity if no
batteries marked as main), and converts battery values to APM form.

---
drivers/battery/Kconfig | 7 +++
drivers/battery/Makefile | 1 +
drivers/battery/apm_power.c | 121 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 129 insertions(+), 0 deletions(-)
create mode 100644 drivers/battery/apm_power.c
diff --git a/drivers/battery/Kconfig b/drivers/battery/Kconfig
index 0c14ae0..bbf8283 100644
--- a/drivers/battery/Kconfig
+++ b/drivers/battery/Kconfig
@@ -15,4 +15,11 @@ config BATTERY_DS2760
help
Say Y here to enable support for batteries with ds2760 chip.

+config APM_POWER
+ tristate "APM emulation"
+ depends on BATTERY && APM
+ help
+ Say Y here to enable support APM status emulation using
+ battery class devices.
+
endmenu
diff --git a/drivers/battery/Makefile b/drivers/battery/Makefile
index 9902513..cea5807 100644
--- a/drivers/battery/Makefile
+++ b/drivers/battery/Makefile
@@ -1,2 +1,3 @@
obj-$(CONFIG_BATTERY) += battery.o
obj-$(CONFIG_BATTERY_DS2760) += ds2760_battery.o
+obj-$(CONFIG_APM_POWER) += apm_power.o
diff --git a/drivers/battery/apm_power.c b/drivers/battery/apm_power.c
new file mode 100644
index 0000000..5e741c1
--- /dev/null
+++ b/drivers/battery/apm_power.c
@@ -0,0 +1,121 @@
+/*
+ * Copyright (c) 2007 Eugeny Boger
+ *
+ * Use consistent with the GNU GPL is permitted,
+ * provided that this copyright notice is
+ * preserved in its entirety in all copies and derived works.
+ */
+
+#include <linux/module.h>
+#include <linux/battery.h>
+#include <linux/apm-emulation.h>
+#include <linux/list.h>
+
+#define BATTERY_PROPERTY(property) (main_battery->get_##property ? \
+ main_battery->get_##property(main_battery) : 0)
+
+static struct battery *main_battery;
+
+static void (*old_apm_get_power_status)(struct apm_power_info*);
+
+static void apm_battery_find_main_battery(void)
+{
+ struct device *dev;
+ struct battery *bat, *batm;
+ int max_capacity = 0;
+
+ main_battery = NULL;
+ batm = NULL;
+ list_for_each_entry(dev, &battery_class->devices, node) {
+ bat = dev_get_drvdata(dev);
+ /* If none of battery devices cantains 'main_battery' flag,
+ choice one with max capacity */
+ if (bat->get_max_capacity)
+ if (bat->get_max_capacity(bat) > max_capacity) {
+ batm = bat;
+ max_capacity = bat->get_max_capacity(bat);
+ }
+
+ if (bat->main_battery)
+ main_battery = bat;
+ }
+ if (!main_battery)
+ main_battery = batm;
+}
+
+static void apm_battery_apm_get_power_status(struct apm_power_info *info)
+{
+ int bat_current;
+
+ down(&battery_class->sem);
+ apm_battery_find_main_battery();
+ if (!main_battery) {
+ up(&battery_class->sem);
+ return;
+ }
+
+ if (BATTERY_PROPERTY(status) == BATTERY_STATUS_FULL)
+ info->battery_life = 100;
+ else
+ if (BATTERY_PROPERTY(max_capacity) -
+ BATTERY_PROPERTY(min_capacity))
+ info->battery_life = ((BATTERY_PROPERTY(capacity) -
+ BATTERY_PROPERTY(min_capacity)) * 100) /
+ (BATTERY_PROPERTY(max_capacity) -
+ BATTERY_PROPERTY(min_capacity));
+ else
+ info->battery_life = -1;
+ if ((BATTERY_PROPERTY(status) == BATTERY_STATUS_CHARGING)
+ || (BATTERY_PROPERTY(status) == BATTERY_STATUS_NOT_CHARGING)
+ || (BATTERY_PROPERTY(status) == BATTERY_STATUS_FULL))
+ info->ac_line_status = APM_AC_ONLINE;
+ else
+ info->ac_line_status = APM_AC_OFFLINE;
+
+ if (BATTERY_PROPERTY(status) == BATTERY_STATUS_CHARGING)
+ info->battery_status = APM_BATTERY_STATUS_CHARGING;
+ else {
+ if (info->battery_life > 50)
+ info->battery_status = APM_BATTERY_STATUS_HIGH;
+ else if (info->battery_life > 5)
+ info->battery_status = APM_BATTERY_STATUS_LOW;
+ else
+ info->battery_status = APM_BATTERY_STATUS_CRITICAL;
+ }
+ info->battery_flag = info->battery_status;
+
+ bat_current = BATTERY_PROPERTY(current);
+ if (bat_current)
+ info->time = ((BATTERY_PROPERTY(capacity) -
+ BATTERY_PROPERTY(min_capacity)) * 60) /
+ bat_current;
+ else
+ info->time = -1;
+
+ info->units = APM_UNITS_MINS;
+
+ up(&battery_class->sem);
+ return;
+}
+
+static int __init apm_battery_init(void)
+{
+ printk(KERN_INFO "APM Battery Driver\n");
+
+ old_apm_get_power_status = apm_get_power_status;
+ apm_get_power_status = apm_battery_apm_get_power_status;
+ return 0;
+}
+
+static void __exit apm_battery_exit(void)
+{
+ apm_get_power_status = old_apm_get_power_status;
+ return;
+}
+
+module_init(apm_battery_init);
+module_exit(apm_battery_exit);
+
+MODULE_AUTHOR("Eugeny Boger");
+MODULE_DESCRIPTION("APM emulation driver for battery monitoring class");
+MODULE_LICENSE("GPL");
--
1.5.0.5-dirty
-
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